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#1059040 - 01/27/22 01:46 PM Hatchery Fish and Wild Fish Naturally Segregate
WDFW X 1 = 0 Offline
My Area code makes me cooler than you

Registered: 01/27/15
Posts: 4549
Interesting read that makes you wonder.

https://idfg.idaho.gov/press/research-fi...tes-after-being

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#1059042 - 01/27/22 02:16 PM Re: Hatchery Fish and Wild Fish Naturally Segregate [Re: WDFW X 1 = 0]
Rivrguy Offline
River Nutrients

Registered: 03/03/09
Posts: 4394
Loc: Somewhere on the planet,I hope
That is a interesting read! In fact for a short article it certainly provides a lot of food for thought.
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#1059044 - 01/27/22 02:44 PM Re: Hatchery Fish and Wild Fish Naturally Segregate [Re: WDFW X 1 = 0]
seabeckraised Offline
Juvenile at Sea

Registered: 05/12/21
Posts: 231
Loc: Mason County
Interesting about the segregation in rivers. I’ve wondered if that was the case for a long time. I know with Coho in specific, I can be catching and releasing wild fish for hours, and then suddenly crack into a hatchery fish. At that time, we’ll generally anchor up and find our limits between there and the next few hundred yards down river, finding almost nothing BUT hatchery fish.

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#1059045 - 01/27/22 02:50 PM Re: Hatchery Fish and Wild Fish Naturally Segregate [Re: WDFW X 1 = 0]
Carcassman Online   content
River Nutrients

Registered: 11/21/07
Posts: 7413
Loc: Olema,California,Planet Earth
We need more of this kind of work. Looks interesting. As I recall, WDG tagged steelhead at Kalama Falls and there were fisheries above. Don't know if they looked at the rec catch.

I thought, at least conventional was, that steelhead were hard to catch. Exploitation rates of 33% for wild and over 50% for hatchery don't seem low to me.

As to catching more than once, a friend was out sampling steelhead. Catch, take scales, get a DNA sample, release. Caught this dude on a fly, worked him up, released him, and cast the same fly at him. Caught him again, hit the first cast.

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#1059047 - 01/27/22 06:35 PM Re: Hatchery Fish and Wild Fish Naturally Segregate [Re: WDFW X 1 = 0]
RUNnGUN Offline
Repeat Spawner

Registered: 12/06/07
Posts: 1382
Just goes to show you, not all what we know is the gospel and shouldn't be implemented as such. Steelhead stray and always have, and are not watershed specific. So the notion of past hatchery practices being taboo, by speading Chambers Steelhead everywhere is BS. It worked then and I bet it would work now if allowed. Then we could again have an early component opportunity like there used to be.
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"Life moves pretty fast. If you don't stop and look around once in a while, you could miss it.” – Ferris Bueller.
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#1059048 - 01/27/22 10:39 PM Re: Hatchery Fish and Wild Fish Naturally Segregate [Re: WDFW X 1 = 0]
skyrise Offline
Returning Adult

Registered: 03/16/00
Posts: 328
Loc: snohomish, wa
Rungun, agree and agree. Plant more fish.
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Where is the wise man? Where is the scholar? Where is the philosopher of this age? Has not God made foolish the wisdom of the world?

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#1059049 - 01/28/22 06:23 AM Re: Hatchery Fish and Wild Fish Naturally Segregate [Re: WDFW X 1 = 0]
Smalma Offline
River Nutrients

Registered: 11/25/01
Posts: 2844
Loc: Marysville
As always, the details are important!

The study says that 33% of tags placed on the wild fish were returned anglers and 55% of the tags placed on hatchery fish were returned. Because the anglers were voluntarily returning the tag information those rates would the floor estimate of the encounter rates.

More importantly in discussing the difference in recoveries of tags from hatchery and wild fish "Lubenau said the reason for that is fairly simple. The two types of steelhead tend to naturally segregate in the river, and anglers focus more attention and effort on hatchery steelhead."

Anyone who have spent much time on rivers with a hatchery terminal area (release site) would quickly recognize that the catch in those areas is dominated by hatchery fish. The wild fish are more broadly distributed while many of the hatchery fish are more clustered near those release/rearing sites.

The real news in this study is the confirmation that the wild steelhead catch and release mortality of 5% used by the managers is reasonable. The measured mortality was 4%.

Curt

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